(gcc.info.gz) Library functions implementation

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 4.14 Library functions
 ======================
 
 The behavior of most of these points are dependent on the implementation
 of the C library, and are not defined by GCC itself.
 
    * `The null pointer constant to which the macro `NULL' expands (C90
      7.1.6, C99 7.17).'
 
      In `<stddef.h>', `NULL' expands to `((void *)0)'.  GCC does not
      provide the other headers which define `NULL' and some library
      implementations may use other definitions in those headers.
 
 

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